lisp - setf中的f代表什么？

Question

LISP 有setf 函数来给变量赋值。现在我一直想知道函数的名称:set 部分很明显，但是 f 后缀代表什么？

Answer 1

F 的实际含义经常被遗忘。根据一些消息来源，f 后缀可以代表:

• 字段(参见例如 answer )
• 表格(见各种教材和手册)

然而，根据 Gabriel 和 Steele 的 The Evolution of Lisp , SETF 来自 Peter Deutsch 的 A Lisp Machine with Very Compact Programs (1973 年出版)，F 代表功能。

在这篇论文中，Peter Deutsch 写道:

The SET function is extended so that so that if the first argument is a list (fn argl ... argn) rather than a variable, the function fn is called in "store" mode with arguments argl ... argn and newvalue (the second argument of SET). SETQ is also extended in the obvious way, but is not particularly useful. A more useful function is (SETFQ (fn argl ... argn) newvalue) which quotes the function name and evaluates everything else. This allows RPLACA, for example, to be defined as (LAMBDA (X Y) (SETFQ (CAR X) Y)).

(强调我的)

Gabriel 和 Steele 解释了这如何成为 SETF:

This name was abbreviated to SETF in Lisp-Machine Lisp.